Therefore, the beam expanding just means to expand the waist and not the beam size.
同时指出扩束应是扩展腰粗而不是光斑尺寸。
The influence of input beam size on the maximum intensity in the focus of singlet lens and achromat was compared.
比较了消色差透镜及单透镜中脉冲初始光腰尺寸对聚焦的影响。
Calculation results reveal that the equivalent beam length is more suitable to describe the beam size of vortex beam after propagation.
数值计算进一步说明，等效光斑尺寸更适合用来表征涡旋光束传输后的光斑大小。
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